Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
quang nhung » quang hung, quan nhung, quang phuong
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, kien sach, thien hach
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hanh trinh quang nhung cong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh trinh quang nhung cong ((dan toan) OR (dan than)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh trinh quang nhung cong ((dan toan) or (dan than)) ban*.